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High School Science Fair Projects

Need a science fair project that's fun, engaging, and appropriately rigorous for a high school science fair? Education.com has assembled a rich collection of high school science fair projects and high school science fair project ideas written by our team of professional scientists, science teachers, and educational consultants. We offer free high school science experiments on every science fair topic, including physics, chemistry, biology, engineering, and even psychology. Check the boxes in the sidebar to filter your results, or use the search bar to find a winning idea for your upcoming science fair. Hundreds of good science fair projects are only a click away.

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Did you ever drink spoiled milk? Find out whether whole milk spoils at the same rate as 2% and skim milk.
Microbiology
Sixth Grade
This science fair project idea determines if mice and rats become aggressive when another mouse or rat is introduced into their territory.
High School
Zoology
Science fair project that compares the biodiversity of fungi in different ecosystems by identifying species of fungi.
Life Science
Fifth Grade
Science fair project idea that compares number and relative sizes of leaf stomata. Collect leaves of plant species, identify, observe stomata with microscope.
Life Science
Ninth Grade
Determine whether the application of Febreeze will lower the bacterial count.
High School
Life Science
This science fair project idea  determines whether dogs can be trained faster using a food reward or praise.
High School
Zoology
This science fair project explores  a personâs eye-color genotype.
High School
Genetics
This science fair project idea  determines whether plants grow better in soil or in fish ponds.
High School
Botany
This science fair project idea explores which is better for diffusion and cell absorbing, more surface area, or more volume.
High School
Life Science
Check out this fun science fair project idea to measure bacterial colonies from door handles and explore the effectiveness of different cleaning agents.
High School
Microbiology

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